Get a waterpik. Use it every day before you go to bed. You can just use tap water–you don’t need to use mouthwash. You will definitely notice a difference in your gum health from this. The difference with flossing is more subtle, but I think it’s real. Yes, flossing is a PITA, but if you can manage to develop the habit, it’s really not that time consuming.
One thing to bear in mind about flossing is that your goal is to scrape the sides of your teeth, not to jam the floss into the gums. Don’t do that. Also, waterpiks work using the bernoulli effect. You want the water to go across the gums, not into the gums: the vaccum they create sucks particles out of pockets in your gums, which reduces the food source available to harmful bacteria.
Anyway, even if you never floss, I heartily recommend using a water pik. Your friends will thank you.